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With the use of a very small amount of soda ash. Maybe a quarter cup. To be safe use smaller amounts and check the pH frequently until you have stabilized the pH at a level that is satisfactory. A pH of 7.2 is not that far out of bounds if you do not have a heater. You might also want to check the total alkalinity. If it is on the high end of the scale or test I would do nothing to raise the pH. The low pH will buffer the high alkalinity.

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15y ago
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Q: If the Ph in a twenty-seven foot round pool is 7.2 how do you increase it too 7.5?
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